If you want to try the look but not necessarily commit, rub a Crayon over the engraving really fast, slowly getting the wax to warm and fill the engraving. Wipe the surface lightly with some alcohol to clean the surface and you will have color filled engravings that can easily be removed later should you get bored or want to sell it. The Crayon engravings I did on my AR cost me nothing in supplies and have lasted for half a year.